Vat dyestuff.



UNiTED sfra'rns PATENT .oFFIo-E, 1

WILHELM BAUER, or VOHWINKEL; Am) ALFRED manna AND mam MYER', or

ELBERFELD, GERMANY, ASSIGNOBS TC FARBENFABRIKEN VORM. FRZEDR. BAYER & v

00., 0F ELQBEBIEEIID, GERMANY,- A CORPORATION OF GERMANY.

No Drawing.

To all whom it may concern:

Be it knownthat We,-.WILHELM BAUER, residingJatVohwinkel, and-,AnriinoHERRE and RUDOLF MAYER, residing at 'Elberfeld, Germany, citizens of theGerman Empire, have invented new 'anduseful Im rovements in VatDyestufl, otwhichthe allowing is a specification.

ur invention relates to and productionfof new and valuable vatdyestufis. They are obtained by condensing monohalogenatedbeta-naphthisatin' derivatives in which the oxygen of the alpha-ketogroup is replaced by easily movable or re- :15

placeable substituent-s, e. g. halogen, sulfur, the amino group, thealkoxy group with'a para-substituted alpha-naphthol, especially@bromq-l-naphthol, 4-cl 1lor0-1-naphthol, 4:- cthoxyJ-naphthol.

The new dyes are in a dry state dark crystalline powders which aresoluble in hot nitrobenzene generally with a blue-coloration, and whichyield with hydrosulfite and caustic soda lye generally yellow vatsdyeing cot-ton after exposure to air bluish-gray to black shadesremarkable for their fastncss to chlorin.-

In order to Illustrate the new process more fully we can proceed asfollows, the parts being by wcighh-(SS) parts of .bronio-beta-.

naphthisatiu are converted into the alpha ehlor-id by heating them withparts of ](-l and 500 parts of dry chlm'obenzene. The mixture thusobtained is then added to a warm solution; which is well stirred, of (30parts of 4-lnzomo-l-uaphthol in (300 parts of dry chlorol'ieuzcne;stirring is continued for about 12 hours. After cooling the dye isfiltered of! and .washed with benzene and ether and can be furtherpurified by a rerrystallization from mtrobenzene. It is a darkcrystalline powder soluble H1 concen- VAT nY'Es rUFF. I

Speclflcatlon or Letters Intent. Application am: June 18, 1am. seinemesmeo. j

i tin furnishes a the manufacture para substituted alphanaphthol, whichdyetheir fastness to chlorin,

Patented Mar. 7, 1911.;

trated sulfuric acid with a bluish-olive color, scarcely soluble inbenzene'and cold nitr'obenzene', soluble in hot nitrohenzene with a bluecolor. It forms a vat with'hydrosul fite and caustic alkali,- from whichcotton is dyed after exposure to air in fast bluishgray to black shades.Ghloro-beta-napthisasimilar product. We claim V Y r 1. The hereindescribed new dyestuffs obtainable from a monohalogenated'betanaphthisatin derivativeinwhich the oxygen of the alpha-'ketogroup isreplaced by easily movable or replaceable substituents and a stufisarein a dry "state dark crystalline powders which are soluble in hotnitrobenzene generally with. a blue-coloration, and which yield-with'hydro'sulfite'and caustic soda lye vats dyeing cotton afterexposure to air from gray to black shades remarkable for substantiallyas scribed. 55

"2. The herein described new dyestutf obtainable from brmnobetanaphthisatinalpha-ehlorid v and l-lJIOlllO-l-Ilfllliltl]0i whichdycstuii' is in a dry state a dark crystalline powder. soluble inconcentrated sulfuric acid with -a liluisli-olive color, and whichyields with hydrosnlfite and caustic soda -l ye.a yellow vat from whichcotton is dyed abluislh gray to black remarkable fol" its fastness toehlori'n. substantially as described. In testimony whereof we bavehereunto set.our hands in the presence of two sub scribing witnesses.

3V] LHELM. BAUEP. IL. ail ALFRED HERRE. |'1. .sf| v HUDOLF MAYER. |L.s.'Witnesses: 7

O'rro Ki'mlo, (*nas. J. \Vnmu'r.

